I have seen this geogprahical gap for Corded Ware and Yamnaya more than once. It even made it into the Haak paper or its release notes.

http://genetics.med.harvard.edu/reic...ature14317.pdf

Is this real? I assume the gap would correspond to the later Middle Dnieper, Fataynovo-Balanovo and Absashevo group of cultures. Is there any reason they are not included with CW? Will they be any genetically different from German or Polish CW?